1. Describe feelings and emotions: Ancient poems often express the author's feelings and emotions by describing natural scenery and characters, thus expressing the author's inner world.
2. Expressing thoughts and philosophy: In ancient poetry, symbols, metaphors, rhetoric and other techniques were used to reflect and discuss problems in life, society and politics, and to express the author's thoughts and philosophy.
3. Express social reality and historical facts: Ancient poems often reflect social reality and historical facts by describing historical events and social phenomena, and reflect the sufferings of people's lives and social changes.
4. Express personal experience and life sentiment: Some ancient poems also take the author's personal experience, sentiment and mental journey as the theme to express the author's thinking, feeling and understanding of life.